In one way, they leave the crapholes they made of the cities, states and countries they live in to move to nicer places. They then start trying to change those places into the crapholes they left.
Perhaps it could be called the “Californians to Colorado/Montana/Northern Utah/Washington [pick one] Syndrome,” or perhaps, “Middle Eastern/North African Migration to Europe Pattern.”
Maybe it’s just the natural behavior of human locusts. Just a thought.